名词
中文翻译：水级
同义词：
['water quality grade', 'water quality level']
例句：
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1. The river hasa water grade of 5, which is considered good for swimming.
这条河的水质等级为5，被认为是适合游泳的。
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2. The government has set strict water grade standards for industrial waste discharge.
政府对工业废水排放设定了严格的水质标准。
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3.The company monitors the water grade of its products to ensure they meet environmental regulations.
该公司监控其产品的质量等级，以确保它们符合环境法规。